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1. WO2014158468 - COMPRESSOR BEARING COOLING

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[ EN ]

CLAIMS

What is claimed is:

1. A compressor (22) comprising:

a housing assembly (40) having a suction port (24) and a discharge port (26) and a motor compartment (60);

an electric motor (42) having a stator (62) within the motor compartment and a rotor (64) within the stator, the rotor being mounted for rotation about a rotor axis (500);

one or more impellers (44) coupled to the rotor to be driven by the rotor about an impeller axis (500) in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;

an inlet guide vane (IGV) array (174) between the suction port and the one or more impellers; and

one or more bearing systems (66, 68) supporting the rotor and/or the one or more impellers,

and further comprising:

one or more drain passages (120, 234, 206; 120, 232, 202, 206) coupled to the bearings to pass fluid along a drain flowpath from the bearings to a location (172) upstream of the impeller and downstream of the IGV array.

2. The compressor of claim 1 wherein:

the one or more drain passages are positioned to pass said fluid to a suction housing plenum.

3. The compressor of claim 1 further comprising:

an ejector (150) having:

a motive flow inlet (152);

a suction flow inlet (154); and

an outlet (156), the drain flowpath passing through the ejector from the suction flow inlet to the outlet.

4. The compressor of claim 3 wherein:

a motive flow flowpath to the motive flow inlet extends from downstream (240) of the one or more impellers.

5. The compressor of claim 3 wherein:

a motive flow flowpath to the motive flow inlet extends from downstream of the one or more impellers but upstream of a discharge plenum (184).

6. The compressor of claim 3 further comprising:

one or more bearing feed passages (94) coupled to the bearings to pass fluid along a supply flowpath to the bearings; and

another ejector (160) having:

a motive flow inlet (162);

a suction flow inlet (164); and

an outlet (166), the supply flowpath passing through the another ejector from the suction flow inlet to the outlet.

7. The compressor of claim 1 wherein:

the one or more impellers is a single impeller mounted to the rotor for direct coaxial rotation therewith.

8. The compressor of claim 1 further comprising:

one or more bearing feed passages (94) coupled to the bearings to pass fluid along a supply flowpath to the bearings; and

an ejector (160) having:

a motive flow inlet (162);

a suction flow inlet (164); and

an outlet (166), the supply flowpath passing through the ejector from the suction flow inlet to the outlet.

9. A vapor compression system comprising:

the compressor of claim 1;

a first heat exchanger (28) coupled to the discharge port to receive refrigerant driven in a downstream direction in the first operational condition of the compressor;

an expansion device (32) downstream of the first heat exchanger; and

a second heat exchanger (30) downstream of the expansion device and coupled to the suction port to return refrigerant in the first operating condition.

10. The system of claim 9 wherein:

at least one of a first ejector (150) along the drain flowpath or a second ejector (160) along a bearing supply path has a motive flow inlet (152; 162) along a motive flow flowpath extending from downstream of the one or more impellers but upstream of a discharge plenum (184).

11. The system of claim 10 wherein:

the first heat exchanger is a heat rejection heat exchanger; and

the second heat exchanger is a heat absorption heat exchanger.

12. A method for operating the compressor of claim 1 comprising:

driving the motor to draw the fluid in through the suction port and discharge the fluid from the discharge port;

operating in a first mode wherein the fluid passing along the drain flow path is drawn as a suction flow through an ejector (150); and

operating in a second mode wherein the fluid passing along the drain flow path is not pumped by the ejector.

13. A compressor (22) comprising:

a housing assembly (40) having a suction port (24) and a discharge port (26) and a motor compartment (60);

an electric motor (42) having a stator (62) within the motor compartment and a rotor (64) within the stator, the rotor being mounted for rotation about a rotor axis (500);

one or more impellers (44) coupled to the rotor to be driven by the rotor about an impeller axis (500) in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;

an inlet guide vane (IGV) array (174) between the suction port and the one or more impellers; and

one or more bearing systems (66, 68) supporting the rotor and/or the one or more impellers,

and further comprising:

one or more drain passages (120, 234, 206; 232, 202, 206) coupled to the bearings to pass fluid along a drain flowpath from the bearings; and

an ejector (150) having:

a motive flow inlet (152);

a suction flow inlet (154); and

an outlet (156), the drain flowpath passing through the ejector from the suction flow inlet to the outlet.

14. A compressor (22) comprising:

a housing assembly (40) having a suction port (24) and a discharge port (26) and a motor compartment (60);

an electric motor (42) having a stator (62) within the motor compartment and a rotor (64) within the stator, the rotor being mounted for rotation about a rotor axis (500);

one or more impellers (44) coupled to the rotor to be driven by the rotor about an impeller axis (500) in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;

an inlet guide vane (IGV) array (174) between the suction port and the one or more impellers; and

one or more bearing systems (66, 68) supporting the rotor and/or the one or more impellers,

and further comprising:

one or more bearing feed passages (94) coupled to the bearings to pass fluid along a supply flowpath to the bearings; and

an ejector (160) having:

a motive flow inlet (162);

a suction flow inlet (164); and

an outlet (166), the supply flowpath passing through the ejector from the suction flow inlet to the outlet.

15. The compressor of claim 14 wherein:

a motive flow flowpath to the motive flow inlet extends from downstream of the one or more impellers.

16. The compressor of claim 14 further comprising:

a switching valve (262) along the supply flowpath between the ejector outlet and the bearings for bypassing the ejector with a supply flow to the bearings.

17. A method for controlling the compressor of claim 14, wherein:

the compressor is used in a vapor compression system having a heat rejection heat exchanger (28), an expansion device (32), and a heat absorption heat exchanger (30),

wherein:

fluid is drawn through the suction port from the heat absorption heat exchanger;

fluid is discharged from the discharge port to the heat rejection heat exchanger;

fluid from the heat rejection heat exchanger is expanded in the expansion device;

fluid expanded in the expansion device is delivered to the heat absorption heat exchanger; and

a portion of the fluid delivered to the heat rejection heat exchanger or the heat absorption heat exchanger is delivered as the motive flow.

18. A vapor compression system comprising:

the compressor of claim 14;

a first heat exchanger (28) coupled to the discharge port to receive refrigerant driven in a downstream direction in the first operational condition of the compressor;

an expansion device (32) downstream of the first heat exchanger; and

a second heat exchanger (30) downstream of the expansion device and coupled to the suction port to return refrigerant in the first operating condition,

wherein the supply flowpath extends from at least one of:

the first heat exchanger; and

the second heat exchanger.